Well...first things first, congratulations for asking before purchasing... you really do need to learn about sygnathids before attempting to keep them.

A good place to start (besides this forum ) is www.seahorse.org. It is where I learned most of the good (and bad) information on keeping seahorses. There are other forums on Reef Central and other sites as well. Keep in mind that anything you learn, should be taken with a grain of salt (pun intended). There are a lot of successful keepers out there who do things vastly different than the other. You need to read, learn and apply the concepts as it pertains to your system.

As far as hardiness... most will say that a good beginner seahorse is the Hippocampus Erectus. They are larger, and therefore easier to feed, care for etc. and more often than not, captive raised. You should really steer clear of any fish that is wild caught, for many reasons, most of which are discussed in this forum or others. In my opinion, there are a lot of good beginner horses, Reidi, Erectus, and Kuda are just a couple that quickly come to mind. There is a species list at the Org that you can review.

In regards to basic info, you can read here, at the Org or (blatant plug here) listen to my podcast at

http://www.talkingreef.com/forums/showthread.php?t=404

There are very few, if any, forum mods and admins that will chastise you for visiting other sites and learning. Whatever you do learn, bring back here and teach us

Do you have any particular questions? Ask away.

Dave